What to reply?

Ok so I met this guy and we really got on well. I have only met him once and he took my number (because we are going to be working together in the near future but he had the choice of 12 people and he choose me which is good for my incredibly low self-esteem :$ ). I quite like him but I know he has a girlfriend so I know nothing will happen (I won't let it!) but he sent me a text saying - Hi, just thought I would drop you a text so that you have my number. What should I reply to this? I don't want to ignore him because that would be rude and I don't want to just send him back a text saying "got it!" or something etc. Please help!

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